WO2007093197A1 - Arrangement de fin de course à vibrations ou procédé pour corriger le point de commutation d'un fin de course à vibrations - Google Patents

Arrangement de fin de course à vibrations ou procédé pour corriger le point de commutation d'un fin de course à vibrations Download PDF

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Publication number
WO2007093197A1
WO2007093197A1 PCT/EP2006/005018 EP2006005018W WO2007093197A1 WO 2007093197 A1 WO2007093197 A1 WO 2007093197A1 EP 2006005018 W EP2006005018 W EP 2006005018W WO 2007093197 A1 WO2007093197 A1 WO 2007093197A1
Authority
WO
WIPO (PCT)
Prior art keywords
temperature
vibration
switching point
fork
unit
Prior art date
Application number
PCT/EP2006/005018
Other languages
German (de)
English (en)
Inventor
Adrian Frick
Martin Mellert
Original Assignee
Vega Grieshaber Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vega Grieshaber Kg filed Critical Vega Grieshaber Kg
Publication of WO2007093197A1 publication Critical patent/WO2007093197A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/296—Acoustic waves
    • G01F23/2966—Acoustic waves making use of acoustical resonance or standing waves
    • G01F23/2967—Acoustic waves making use of acoustical resonance or standing waves for discrete levels

Definitions

  • the invention relates to a vibration limit switch arrangement with the preamble features of patent claim 1 and to a method for correcting a vibration limit switch arrangement switching point having the above-mentioned features of patent claim 9.
  • Vibrationsgrenzschalteran- orders are known in which a vibratory unit, for example a fork in the form of a tuning fork, protrudes at a predetermined height in the container, wherein the oscillatory unit part of a mechanical electrical vibration system is.
  • a vibrating transmission and / or vibration receiving device is arranged on the tuning fork to generate depending on an excitation signal, a vibration which causes the tuning fork in mechanical vibrations. Vibrations caused by the excitation converter are detected by a receiving transducer in order to output suitable signaling and / or control signals to further devices and components by means of an evaluation device.
  • a tuning fork from a top of the container a ⁇ s used in the vertical direction or laterally through the container wall in the horizontal direction in the container interior.
  • a vibration transmitting and vibration receiving device are usually piezoelectric drive units which are excited by means of the exciter signal and vibrated.
  • the oscillation frequency usually corresponds to the resonant frequency of the tuning fork.
  • a corresponding receive circuit makes it possible to measure this frequency.
  • the object of the invention is to expand the field of application of such sensors and vibration limit switches or to propose a control method which makes this possible. This is based on the desire to use at higher temperatures than the currently maximum
  • the object of the invention is therefore, in particular, to provide a vibrating level switch arrangement or vibration level measuring arrangement or a method which makes it possible to compensate for a switching point drift due to increasing temperatures in the interior of the container.
  • This object is achieved by a vibration limit switch arrangement or vibration level measuring arrangement having the features of patent claim 1 or by a method for correcting a vibration limit switch switching point according to the features of patent claim 9.
  • Advantageous embodiments are the subject of the dependent claims.
  • a vibration limit switch arrangement or vibration level measuring arrangement with an oscillatable unit in particular in the form of a fork, a vibration transmission and / or vibration receiving device for generating a vibration for the oscillatory unit is dependent on an excitation signal or for receiving a vibration from the oscillatory Unit and generating a received signal depending on the received oscillation, a control device for providing the excitation signal and / or processing the received signal and an evaluation device for processing the oscillation frequency, wherein a temperature determining means for determining a temperature of the oscillatory unit or one of the oscillatory Unit adjacent space is provided.
  • the control device for providing the excitation signal and / or for processing the received signal and the evaluation device for processing the oscillation frequency can optionally also be formed by a single component, for example by means of an integrated circuit.
  • the space adjacent to the oscillatory unit is a container interior of a container with a filling medium whose
  • Limit or level is to be determined by means of the arrangement.
  • the arrangement is particularly advantageous for a level measurement, level measurement with temperature-compensated fork in eg the mm range can also be implemented with a suitably designed and controlled arrangement.
  • the temperature determination device is formed by a temperature sensor in the container interior.
  • the temperature determination device is formed by a temperature sensor which is connected to the oscillatable unit or is coupled between the oscillatable unit and the vibration transmission and / or vibration reception device.
  • Particularly preferred is an arrangement with a correction device for correcting a temperature-dependent change of a switching point or a switching point frequency, wherein the correction device is formed in particular by the evaluation device.
  • a memory device for storing fork parameters of the vibration capable unit formed as a Ga including a modulus of elasticity of the fork material for carrying out the temperature-dependent change of a switching point frequency.
  • the correction device is designed to incorporate a change in the density of the filling material as a function of the temperature.
  • a method for correcting a vibration limit switch switching point in which by means of a control means an excitation signal for exciting a vibration transmitting device is generated, wherein the vibration of the vibration transmitting device to a vibratory unit, in particular fork, or on a vibratory unit in a Behaltnisinnenraum a container is transmitted, and wherein a switching point correction carried out in particular depending on a filling medium of the container is determined, wherein a temperature of the oscillatory unit o- one of the oscillatory unit adjacent space and is used by the evaluation device for temperature-dependent correction of the Wegigefreguenz.
  • a method is preferred in which a temperature increases with direction of the product, i. spatially displaced with vertically installed sensor in the direction of the fork tip switching point by the temperature-dependent compensation of the switching point frequency is compensated.
  • an uncovered frequency is determined as a frequency of the uncovered oscillatable unit in air and a coverage frequency is calculated as a function of a set density of the filling material.
  • the switching point frequency is then formed from preferably the arithmetic mean of these frequencies.
  • a method is preferred in which the temperature dependence of the modulus of elasticity of the oscillatory unit is taken into account in the evaluation of the received signal.
  • a method is preferred in which parameters are stored in a memory as part of a calibration of the vibration limit switch arrangement and / or before commissioning by a customer, the parameters influencing a switching point frequency as a function of the temperature.
  • a method is preferred in which a density change of the density of the filling material is included in the calculation of the switching point frequency via the temperature, in particular in the case of a constant filling material of the container.
  • a corresponding sensor is provided, which is placed as possible without temperature gradient in the vicinity of the fork.
  • a temperature sensor is part of an evaluation electronics, so that the frequency of the fork in air can be calculated for each temperature, depending on the modulus of elasticity of the tuning fork material.
  • a temperature-dependent switching point shift can be counteracted.
  • the temperature characteristic of the modulus of elasticity of the fork is stored only during calibration in a particular non-volatile memory.
  • the contents remaining the same can include a change in density of the contents over a detected temperature additionally in the calculation.
  • the corresponding parameters can either be transmitted during calibration of the sensor or before commissioning by a customer to such a memory which is assigned to the corresponding evaluation device.
  • FIG. 1 is a partial sectional view of a container with individual components of a vibration limit switch arrangement for schematically illustrating a basic principle
  • Fig. 2 is a diagram for illustrating the influence of an immersion depth on a vibration frequency of a fork
  • Fig. 3 is a fork frequency in air and switching thresholds without or with tracking.
  • Fig. 1 shows a vibration limit switch assembly 1 with a schematically illustrated fork 2 as a vibratory unit.
  • the fork preferably has two paddles 10.
  • a vibration transmission device of a vibration transmission and / or vibration receiving device 3 in the form of preferably one or more piezoelectric elements generates depending on an excitation signal s an exciter vibration, which is coupled into the fork 2.
  • the mechanical vibration generated thereby is converted by the vibration transmission and / or vibration receiving device 3 into a received signal e.
  • a control device 4 which can be provided as a component of the vibration limit switch, the exciter signal s is provided.
  • the resonant frequency fr of the fork 2 is dependent on a temperature T of the fork 2, that is, a temperature T in a space region in which the fork 2 is used.
  • An evaluation device 11 or a combined control and evaluation device is preferably used for processing and / or evaluating the received signal e in order to provide corresponding display and / or switching signals.
  • a rear end of the fork 2 is guided through a container opening 7 in an upper wall of the container 5.
  • the vibrating limit switch arrangement 1 is used to determine the limit level of the filling medium 6 within the container 5. In particular, when the height h of the filling medium 6 reaches the fork 2, a corresponding switching signal can be output.
  • the filling medium has a density p of which the resonance frequency fr of the oscillating fork 2 is affected when the fork touches the filling medium 6.
  • At least one temperature determination device is provided, which the Temperature T of the fork itself or the temperature T in preferably immediate environment of the fork 2 determined.
  • the specific temperature T is then fed to the evaluation device 11, which then carries out a corresponding correction or adaptation of the switching point frequency, provided that a corresponding switching point drift to be compensated would otherwise occur.
  • a temperature-determining device various temperature sensors can be used. Shown is as a first example, a directly coupled to the fork 2 temperature sensor 8, which is in the illustrated matterssbeii- game between the fork 2 and the vibration transmission and / or vibration receiving device 3 is arranged.
  • a temperature sensor 8 * can also be arranged as a component separated from the fork 2 in the container interior, in which case the arrangement is preferably made close to the fork 2. This makes it possible to track the switching thresholds of the vibration limit switch arrangement as a function of the temperature T, as is outlined with reference to FIG.
  • a temperature sensor is part of the evaluation electronics, then depending on the modulus of elasticity E of the fork 2, the frequency fr of the fork 2 in air can be calculated for each temperature T.
  • the set density p of the filling medium 6 it is possible to determine a so-called covering frequency as the frequency of a fork covered by the filling medium and thus by means of the evaluation device 11 to set the switching point frequency precisely to the arithmetic mean of covering frequency and an uncovered frequency.
  • a density change of this over the temperature T are additionally included in the calculation.
  • the vibration limit switch arrangement comprises a memory device 9, which provides parameters for the evaluation device 11.
  • the memory device 9 is used for storing parameters such as the elastic modulus E of the fork 2 and characteristic values for its temperature dependence.
  • corresponding compensation curves and compensation characteristics can be stored in the memory device 9.

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

L'invention concerne un arrangement (1) de fin de course à vibrations ou un arrangement de mesure de niveau à vibrations et un procédé pour utiliser celui-ci avec une fourche (2), un dispositif (3) émetteur d'oscillations et/ou récepteur d'oscillations pour générer une oscillation (w(fr)) pour la fourche en fonction d'un signal d'excitateur ou pour recevoir une oscillation de la fourche et générer un ou plusieurs signaux reçus en fonction de l'oscillation reçue et un dispositif (4) de commande pour délivrer le signal d'excitateur et/ou pour traiter le signal reçu, un dispositif (8, 8*) de détermination de la température destiné à déterminer une température (T) de la fourche ou d'un espace voisin de la fourche étant fourni.
PCT/EP2006/005018 2006-02-15 2006-05-26 Arrangement de fin de course à vibrations ou procédé pour corriger le point de commutation d'un fin de course à vibrations WO2007093197A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006007199.9 2006-02-15
DE200610007199 DE102006007199A1 (de) 2006-02-15 2006-02-15 Vibrationsgrenzschalteranordnung bzw. Verfahren zum Korrigieren eines Vibrationsgrenzschalter-Schaltpunktes

Publications (1)

Publication Number Publication Date
WO2007093197A1 true WO2007093197A1 (fr) 2007-08-23

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DE (1) DE102006007199A1 (fr)
WO (1) WO2007093197A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202009005513U1 (de) 2009-04-11 2010-09-02 Sick Ag Vibrationsfüllstandsmessvorrichtung
US8752426B2 (en) 2009-09-16 2014-06-17 Endress + Hauser Gmbh + Co. Kg Fill-level measuring device
US9423287B2 (en) 2009-12-29 2016-08-23 Endress + Hauser Gmbh + Co. Kg Apparatus for determining at least one process variable

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007043811A1 (de) 2007-09-13 2009-03-19 Endress + Hauser Gmbh + Co. Kg Verfahren zur Bestimmung und/oder Überwachung der Viskosität und entsprechende Vorrichtung
GB0820853D0 (en) 2008-11-14 2008-12-24 Mobrey Ltd Vibrating element apparatus
DE102008054945A1 (de) 2008-12-19 2010-06-24 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Bestimmung und/oder Überwachung einer Prozessgröße
DE102010030791A1 (de) 2010-07-01 2012-01-05 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Bestimmung und/oder Überwachung einer Prozessgröße eines Mediums
DE102013109277A1 (de) * 2013-08-27 2015-03-05 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Bestimmung oder Überwachung einer Prozessgröße
DE102015112055A1 (de) 2015-07-23 2017-01-26 Endress + Hauser Gmbh + Co. Kg Vibronischer Sensor zur Bestimmung oder Überwachung einer Prozessgröße
DE102015112544A1 (de) 2015-07-30 2017-02-02 Endress+Hauser Gmbh+Co. Kg Vorrichtung zur Bestimmung oder Überwachung einer Prozessgröße
DE102015114286A1 (de) 2015-08-27 2017-03-02 Endress + Hauser Flowtec Ag Vibronische Vorrichtung zur Bestimmung oder Überwachung einer Prozessgröße
DE102016125243A1 (de) 2016-12-21 2018-06-21 Endress+Hauser SE+Co. KG Vibronischer Sensor mit Temperaturkompensation
DE102017114315A1 (de) 2017-06-28 2019-01-03 Endress+Hauser SE+Co. KG Temperaturbestimmung mit einem vibronischen Sensor
DE102018128734A1 (de) 2018-11-15 2020-05-20 Endress+Hauser SE+Co. KG Vibronischer Sensor mit Temperaturkompensation
DE102019109487A1 (de) 2019-04-10 2020-10-15 Endress+Hauser SE+Co. KG Zustandsüberwachung eines vibronischen Sensors
DE102019131485A1 (de) 2019-11-21 2021-05-27 Endress+Hauser SE+Co. KG Zustandsüberwachung eines vibronischen Sensors
DE102020116278A1 (de) * 2020-06-19 2021-12-23 Endress+Hauser SE+Co. KG Vibronischer Multisensor

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EP0355038A1 (fr) * 1988-07-20 1990-02-21 B.V. Optische Industrie "De Oude Delft" Dispositif de mesure du niveau de l'interface entre un premier et un deuxième milieu dans un réservoir
DE10057974A1 (de) * 2000-11-22 2002-05-23 Endress Hauser Gmbh Co Verfahren und Vorrichtung zur Feststellung und/oder Überwachung des Füllstands eines Mediums in einem Behälter bzw. zur Ermittlung der Dichte eines Mediums in einem Behälter
DE10237931A1 (de) * 2002-08-14 2004-02-26 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Überwachung eines vorbestimmten Füllstands eines Messmediums in einem Behälter
WO2004036191A1 (fr) * 2002-10-18 2004-04-29 Symyx Technologies, Inc. Capteur de fluide de machine et procede associe
EP1624291A2 (fr) * 2004-08-02 2006-02-08 VEGA Grieshaber KG Auto-diagnostic d'un détecteur de niveau à vibrations
US20060031030A1 (en) * 2004-04-21 2006-02-09 Symyx Technologies, Inc. Portable fluid sensing device and method

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EP1596169B1 (fr) * 2004-05-14 2012-05-30 F. Hoffmann-La Roche AG Détecteur de niveau pour détecter le contact d'une aiguille de pipette avec un liquide dans un réservoir

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Publication number Priority date Publication date Assignee Title
EP0355038A1 (fr) * 1988-07-20 1990-02-21 B.V. Optische Industrie "De Oude Delft" Dispositif de mesure du niveau de l'interface entre un premier et un deuxième milieu dans un réservoir
DE10057974A1 (de) * 2000-11-22 2002-05-23 Endress Hauser Gmbh Co Verfahren und Vorrichtung zur Feststellung und/oder Überwachung des Füllstands eines Mediums in einem Behälter bzw. zur Ermittlung der Dichte eines Mediums in einem Behälter
DE10237931A1 (de) * 2002-08-14 2004-02-26 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Überwachung eines vorbestimmten Füllstands eines Messmediums in einem Behälter
WO2004036191A1 (fr) * 2002-10-18 2004-04-29 Symyx Technologies, Inc. Capteur de fluide de machine et procede associe
US20060031030A1 (en) * 2004-04-21 2006-02-09 Symyx Technologies, Inc. Portable fluid sensing device and method
EP1624291A2 (fr) * 2004-08-02 2006-02-08 VEGA Grieshaber KG Auto-diagnostic d'un détecteur de niveau à vibrations

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202009005513U1 (de) 2009-04-11 2010-09-02 Sick Ag Vibrationsfüllstandsmessvorrichtung
US8752426B2 (en) 2009-09-16 2014-06-17 Endress + Hauser Gmbh + Co. Kg Fill-level measuring device
US9423287B2 (en) 2009-12-29 2016-08-23 Endress + Hauser Gmbh + Co. Kg Apparatus for determining at least one process variable

Also Published As

Publication number Publication date
DE102006007199A1 (de) 2007-08-16

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